I prefer an upgrade of buying/Selling option from the market

how many people selling items at 99 pieces if most ppl only need 1...
I understand them, 1 retainer "only" has 20 slots for selling items! Wich isnt much <,<

there should be an option!

Example: some1 placed 45x of an item

"How much do you want to buy?"
"Inserts number 2"
"You have purchased 2 items"

We can do this on NPC stores! Why not from market too?